[missing_fields_in_debug]: don't ICE when self type is a generic param
#10897
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r? @dswij (rustbot has picked a reviewer for you, use r? to override) |
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type_of on generic paramsmissing_fields_in_debug]: don't ICE when self type is a generic param
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Jun 7, 2023
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Thanks! Interesting case @bors r+ |
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☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test |
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[`missing_fields_in_debug`]: make sure self type is an adt Fixes #11063, another ICE that can only happen in core. This lint needs the `DefId` of the implementor to get its fields, but that ICEs if the implementor does not have a `DefId` (as is the case with primitive types, e.g. `impl Debug for bool`), which is where this ICE comes from. This PR changes the check I added in #10897 to be more... robust against `Debug` implementations we don't want to lint. Instead of just checking if the self type is a type parameter and "special casing" one specific case we don't want to lint, we should probably rather just check that the self type is either a struct, an enum or a union and only then continue. That prevents weird edge cases like this one that can only happen in core. Again, I don't know if it's even possible to add a test case for this since one cannot implement `Debug` for primitive types outside of the crate that defined `Debug` (core). I did make sure that this PR no longer ICEs on `impl<T> Debug for T` and `impl Debug for bool`. Maybe writing such a test is possible with `#![no_core]` and then re-defining the `Debug` trait or something like that...? changelog: [`missing_fields_in_debug`]: make sure self type is an adt (fixes an ICE in core) r? `@Alexendoo` (reviewed the last PRs for this lint)
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Fixes #10887
This PR fixes an ICE that happens when the implementor (self type) of a
Debugimpl is a generic parameter.The lint calls
TyCtxt::type_ofwith that self type, which ICEs when called with generic parameters, so this just adds a quick check before getting there to ignore them.That can only happen inside of core itself (afaik) because the orphan rules forbid defining an impl such as
impl<T> Debug for Toutside of core, so I'm not sure how to add a test for this.It seems like this impl in particular caused this: https://doc.rust-lang.org/stable/std/fmt/trait.Debug.html#impl-Debug-for-F
changelog: [
missing_fields_in_debug]: don't ICE on blanketDebugimpl in core